Semi Truck Repair in Mercer, PA & Youngstown, OH
Mobile and in-shop diesel repair backed by 16+ years of hands-on experience. Founded in Youngstown, OH, with our shop in Mercer, PA.
About Us
A&M Diesel Truck Repair was founded in Youngstown, OH by Matt Jennings, a seasoned mechanic with over 16 years of hands-on experience. For years, Matt balanced his mobile repair work alongside a full-time job at Aim Transportation. Working alongside his business partner, Aaron Ryan, bringing eight years of mechanical experience along with him. As demand for their services grew, they made the decision in April 2025 to go all in - turning Matt's lifelong side business into a full-time career.
Services in Youngstown, OH
Looking for a repair service that puts honesty, expertise, and convenience first? At A&M Diesel Truck Repair, we deliver professional service, on-site or in our Mercer, PA shop, that keeps trucks, buses, and heavy equipment running smoothly—day or night. Bring your truck to our shop in Mercer, PA, or we'll come to you anywhere within a 120-mile radius of Youngstown, OH.
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News & Articles
Find regular articles covering a wide range of topics related to diesel repair, maintenance, and troubleshooting.
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Don't Take our word for it.
Read Customer Testimonials.
"They are on time, fast repair and very knowledgeable about repair and explaing the problem. Will be using for all my vehicles need. They explained everything where I understood. They also explained why the problem started and ecommend using this company"
"I had car troubles and was stranded on the side of the road so decided to call A&M Mobile repair and I’m SO grateful I did! They were quick, efficient, professional and reasonably priced. Hopefully I won’t have any more car issues but if I do, I’ll definitely be using them again!"
"I would recommend this business to anyone! My alternator went out in my sprinter van in Ohio and I was stranded. Everyone gave me estimates of $1200 or more and Matt came and got me back on the road for less than $1k. He’s very reasonable, professional, reliable, and really knows his stuff!"
Frequently Asked Questions
Find detailed responses to some of our most frequently asked questions.
As well as Youngstown, OH, we also proudly service Akron, OH; Cleveland, OH; Canton, OH; Wheeling, OH; Pittsburgh, PA; Erie, PA; Johnstown, PA; Jamestown, NY; Morgantown, OH; Greensburg, PA; and Indiana, PA. Our mobile service covers a 120-mile radius so you’re always within reach.
Ignoring transmission issues can quickly lead to complete failure. Slipping gears or hard shifting will only worsen over time, potentially leaving your truck undrivable. In severe cases, ignoring repairs may cause damage to connected driveline components, leading to even higher repair costs.
Common signs include knocking sounds, excessive smoke, difficulty starting, and loss of power. Problems with injectors, fuel delivery, or compression can cause these symptoms. Prompt repair is essential to prevent larger failures, as diesel engines rely heavily on proper fuel combustion for performance.
Preventive maintenance is regular servicing—like oil changes, inspections, and filter replacements—designed to catch problems before they lead to breakdowns. It improves safety, extends equipment life, and saves money in the long run.
Yes. As a mobile-only repair service, we handle most repairs where your vehicle or equipment is located. This includes roadside assistance for breakdowns and scheduled service at your yard or jobsite.
Contact Us
Let us know what is going on with your vehicle, and we will get back to you soon with a quote.